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Pretty sure this happened many times in TVC. You can normally tell when they cross to the location that World have joined News 24 - there's a big pause and no personal thank you.
Interesting to see that, as yet there hasn't been any joint BBC News Special between the News Channel and BBC World, both channels launching their normal programs on the TOTH, (Impact on WN) before joining Mishal Hussein to anchor events from Cairo. The Feed controlled by B or C's gallery it would seem due to the appearance of 'Local Time' on the bug. Jeremy Bowen seems to be seeing some harrowing images.
Pretty sure this happened many times in TVC. You can normally tell when they cross to the location that World have joined News 24 - there's a big pause and no personal thank you.